Major changes:

* Added Cache.
* Added OutputCache and tests.
* Added CacheFileProvider and tests.
* Added CacheIdleProvider.
* Separate ViewContext for each view.
* Support for nested layouts.
* Added events in HttpResponseBase. Added flush method for partial output of content.
* Improved HttpRequestBase.
* Improved performance.
* Removed QueryString.

Author: meet-aleksey

.gitignore

@@ -2,3 +2,5 @@
 /composer.lock
 /docs
 /output
+/cache
+/tests/mvc/cache

src/ActionContext.php

@@ -55,6 +55,20 @@ class ActionContext {
      */
     protected $filters;
 
+    /**
+     * Gets or sets output cache settings.
+     * 
+     * @var array;
+     */
+    protected $outputCache;
+
+    /**
+     * Gets or sets cache entry key.
+     * 
+     * @var string
+     */
+    protected $cacheKey;
+
     /**
      * Initializes a new instance of the ActionContext for the current request.
      * 
@@ -69,12 +83,15 @@ public function __construct($httpContext) {
             $this->actionName = $httpContext->getActionName();
             $this->arguments = $httpContext->getArguments();
             $this->controller = $httpContext->getController();
+            $this->outputCache = $httpContext->getOutputCacheSettings();
         }
         else {
             $this->httpContext = $httpContext;
             $this->route = $httpContext->getRoute();
             $this->modelState = new ModelState();
             $this->filters = array();
+            $this->outputCache = array();
+            $this->arguments = array();
         }
     }
 
@@ -132,6 +149,17 @@ public function getActionName() {
         return $this->actionName;
     }
 
+    /**
+     * Checks the equivalence of the specified string with the name of the action.
+     * 
+     * @param string $name The string to compare.
+     * 
+     * @return bool
+     */
+    public function actionNameEquals($name) {
+        return $this->actionName == strtolower($name);
+    }
+
     /**
      * Returns list of filters.
      * 
@@ -142,13 +170,12 @@ public function getFilters() {
     }
 
     /**
-     * Checks the equivalence of the specified string with the name of the action.
+     * Returns output cache settings.
      * 
-     * @param string $name The string to compare.
-     * 
-     * @return bool
+     * @return array
      */
-    public function actionNameEquals($name) {
-        return $this->actionName == strtolower($name);
+    public function getOutputCacheSettings() {
+        return $this->outputCache;
     }
+
 }

src/Cache.php

@@ -0,0 +1,105 @@
+<?php
+namespace PhpMvc;
+
+/**
+ * Represents the cache.
+ */
+final class Cache {
+
+    /**
+     * Gets or sets cache provider.
+     * 
+     * @var CacheProvider
+     */
+    private $provider = null;
+
+    /**
+     * Initializes a new instance of the Cache class.
+     * 
+     * @param CacheProvider $provider The cache provider instance.
+     */
+    public function __construct($provider) {
+        if (!isset($provider) || !$provider instanceof CacheProvider) {
+            throw new \Exception('The type of $provider must not be null and must implement the "\PhpMvc\CacheProvider".');
+        }
+
+        $this->provider = $provider;
+    }
+
+    /**
+     * Inserts a cache entry into the cache.
+     * 
+     * @param string $key A unique identifier for the cache entry.
+     * @param mixed|callback $value The value to insert.
+     * @param int $duration The duration of storage the cache entry (in seconds).
+     * @param string $regionName A named region in the cache to which the cache entry can be added.
+     * 
+     * @return void
+     */
+    public function add($key, $value, $duration, $regionName = null) {
+        $this->provider->add($key, $value, $duration, $regionName);
+    }
+
+    /**
+     * Removes all cache entries.
+     * 
+     * @param string $regionName A name of region.
+     * 
+     * @return int Number of deleted records.
+     */
+    public function clear($regionName = null) {
+        return $this->provider->clear($regionName);
+    }
+
+    /**
+     * Checks whether the cache entry already exists in the cache.
+     * 
+     * @param string $key A unique identifier for the cache entry.
+     * @param string $regionName A name of region.
+     * 
+     * @return bool
+     */
+    public function contains($key, $regionName = null) {
+        return $this->provider->contains($key, $regionName);
+    }
+
+    /**
+     * Gets the specified cache entry from the cache as an object.
+     * 
+     * @param string $key A unique identifier for the cache entry.
+     * @param string $regionName A name of region.
+     * 
+     * @return mixed
+     */
+    public function get($key, $regionName = null) {
+        return $this->provider->get($key, $regionName);
+    }
+
+    /**
+     * Gets a cache entry, or adds it if there is no cache entry.
+     * 
+     * @param string $key A unique identifier for the cache entry.
+     * @param mixed|callback $value The value to insert.
+     * @param int $duration The duration of storage the cache entry (in seconds).
+     * @param string $regionName A name of region.
+     * 
+     * @return mixed
+     */
+    public function getOrAdd($key, $value, $duration, $regionName = null) {
+        return $this->provider->getOrAdd($key, $value, $duration, $regionName);
+    }
+
+    /**
+     * Removes the cache entry from the cache.
+     * 
+     * @param string $key A unique identifier for the cache entry.
+     * @param string $regionName A name of region.
+     * 
+     * @return mixed An object that represents the value of the removed cache entry that was specified by the key,
+     * or null if the specified entry was not found.
+     */
+    public function remove($key, $regionName = null) {
+        return $this->provider->remove($key, $regionName);
+    }
+
+}